EDITOR JOSEPH F. BUNNETT ASSOCIATE
EDITORS
Bruce H. M a h a n J o h n E . Mc M u r r y
EDITORIAL
Published
ADVISORY
BOARD
Ralph N. Adams
M . A. E l - S a y e d
Erwin Klingsberg
F r e d Basolo
J o h n T . Gerig
Daniel E. Koshland, Jr.
R. S t e p h e n B e r r y
Jack Halpern
Ronald N. McElhaney
J e r o m e A. B e r s o n
Harold Hart
Fred W. McLafferty
M a r j o r i e C. C a s e r i o
Roald Hoffmann
E v a L. M e n g e r
E d w a r d A. Collins
Milton Kerker
Richard W. R a m e t t e
by the
AMERICAN CHEMICAL SOCIETY BOOKS AND JOURNALS DIVISION D. H. Michael Bowen
Director
Editorial Department: Charles R. Bertsch, Head; Marianne C. Brogan, Associate Head Graphics and Production Department: Bacil Guiley, Head Research and Development Department: Seldon W. Terrant, Head
© Copyright, 1976, by the American Chemical Society. No part of this publication may be reproduced in any form without permission in writing from the American Chemical Society. Published monthly by the American Chemical Society at 20th and Northampton Sts., Easton, Pa. 18042. Second-class postage paid at Washington, D.C., and at additional mailing offices. Editorial Information Accounts of Chemical Research publishes concise, critical reviews of research areas currently under active investigation. Most articles are written by scientists active in the area reviewed. Reviews may be concerned in large part with work in the author's own laboratory, providing that relevant contributions by other investigators are mentioned sufficiently to place the author's research in perspective. Articles should be directed concurrently to a general audience of research-minded chemists and to scientists directly concerned with the subject of the article. In
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